66765864811 has 2 divisors, whose sum is σ = 66765864812. Its totient is φ = 66765864810.

The previous prime is 66765864757. The next prime is 66765864827. The reversal of 66765864811 is 11846856766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66765864811 - 2¹⁷ = 66765733739 is a prime.

It is not a weakly prime, because it can be changed into another prime (66766864811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33382932405 + 33382932406.

It is an arithmetic number, because the mean of its divisors is an integer number (33382932406).

Almost surely, 2^66765864811 is an apocalyptic number.

66765864811 is a deficient number, since it is larger than the sum of its proper divisors (1).

66765864811 is an equidigital number, since it uses as much as digits as its factorization.

66765864811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 58.

The spelling of 66765864811 in words is "sixty-six billion, seven hundred sixty-five million, eight hundred sixty-four thousand, eight hundred eleven".